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- #include <cmath>
- #include <cstdio>
- #include <vector>
- #include <iostream>
- #include <algorithm>
- #include <map>
- using namespace std;
- int main() {
- int n,k;
- map <int,int> a;
- cin >> n >> k;
- int temp;
- for(int i=0; i<n;i++){
- cin >> temp;
- a[temp]++;
- }
- int cnt=0;
- vector<pair<int, int>> v(a.begin(), a.end());
- for(int i=0; i<n; i++){
- for(int j=i+1; j<n; j++){
- if((v[i].first+v[j].first)%k==0)
- cnt+=v[i].second+v[j].second;
- }
- }
- cout << cnt;
- return 0;
- }
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